Grinding machine



R. D. GARDNER' GRINDING MACHINE May '15. 192 1,670,111

Original Filed April 10, 192 2 Sheets-Sheet 1 R. D. GARDNER May 15.1928.

GRINDING MACHINE aizi ezz ioz" gage/Z10 kzzizzez' Original Filed April10, .1922

Patented May 15, 1928.

wise STAT S,

e a-in WENT-95519 559 I RALPii 1). GAItDN ER, or BELOI'I, wIscoNsIN,ASSIGNOR or ONE-THIRD TO'EDW'ABD B.

9 H GARDNER AND O E- 111313 To'Jo NIELSEN.

' 1 GRINDING MACHINE- Original application filed April 10, 1922','Serial No. 551,008. :Divided. and this application filed June 28, v1923., Serial No. 648,217. t a v This invention pertains to grindingmach nes and/the present application consti- ,tutes a division of mypending application,

Ser. No. 551,008, filed April 10, 1922.

--One of; the primarypurposes of my present invention is to provide foraccurate dressing of the faces of the grinding-wheels, and with this endin view, my invention contemplatesthe provision Y of a wheel dresser,andfa; novel mounting therefor whereby the dresser may be positionedinproper relationto the wheels toinsurethat they beuni formly andaccurately dressed. I Another; object is to provide an adjustableabutment for limiting the approaching movement of the grinding toolssothat they will be accurately ;;positioned with relation tothe wheeldresser whenever the dressing operation isperformed. v

Other objects and advantages of this inventionshould be apparent as thesame becomes betterunderstood by reference to the following description,when considered in c nnection -with the accompanying draw- Referrmgtothe drawings:

. v.a-Fig. l is areal elevation, of'a machine embodying my invention; 1s a v I Fig. 2-:is an end elevation looking toward the left at. Fig. 1

ig, 3 is a fragmentary plan view of wheel dresser mounting; and,

5 Fig.4 is a vertical sectional view taken on line 44 oft-Figure 3. I

'Byreference to theqdrawings it willbe observed that the machinecomprises essentially' a-frame or base portion 4 upon which the variousoperating mechanisms: are mounted, as will be' later explained. Theupper face of the frame at each side of the center thereof isshaped toprovide aguideway fi, andupon each of these guidewaysthereis.reciprocably disposed a carriage; 6 provided withsuitablebearings in; which the journaledr-U'pon theinner end of 'each ofthese shafts there is .mounted a grinding weel 8 The shaftsmayfbeequipped with mountejd thereon ;are; moved 7 toward 7 and from acho her:by. suitablewm moperated from a rock shaft 1 which is nor- .the face ofone of the. wheels. I observed hom n 1 that therod 25 isIproa weight 10suspended, therefrom. The rock shaft isjequipped witha' pinion,- 12

meshing with a rackf1'3, carried by one of the carriages 6, andwith arack bar 14 pivotally connecte d with the other carriage, as

will be apparentfrom Fig. 1.

The shaft 11 is rocked in a clockwise direction, view ng. Fig. 1, tomove the grlndlng toolsaparhby means of cam '15 2) fixed upon acontinually rotating shaft 16 and engaging a stud projecting laterallyfrom an arm 18 fixed on the shaft l1,'but at the opposite side of themachine from the armiilO. Manual actuation of the shaft 3 a gainsttheaction ofthe weights 10 may be effected when desired bymeans of a handleverl9,-'fixecl on the shaft 11 djacent to the arm 18. Theshaft 16isdriv en' from" a train of gearing to which power is trans ,mittedthrough a drive-shaft 2 l from a variable speed pulley 22 driven by abelt in the usual manner.

of the grinding tools during normal loperation of the machine,islirnited' by an abut- The approaching movement ment bar, equipped witha micrometer'ad .Forlthe purpose of dressing the facesof the wheels when.suchbecomes necessary, I

have mounted at rear of the machine up} on a ,bracket 23' af stan'dard24 carrying a wheel dressei rod 25, which is providedv at itsforward endwith a wheel dresser 26pro- .jecting at one side of the rod andnormallydisposed outside the perimeter of, the vgrindustment, all as explainedin my prior ap- 'plication, previously. mentioned.

ing-wheelsB, as shown in 2. When dressing of the wheels becomesnecessary, thGTOCl 25-is,sl id longitudinallyforward to Zdisp ose: thewheel dresser between thewheels and. in position to' engage andzoperateupon It will be videdwith longitudinally extending grooves 27 and 28, inwhich-apin 29 is engagedi to prevent rotation of the rod. When one ofthe wheels has been dressed, the pin withdrawn, the rod? 25 is givenahalf turn the dresser'in position.

In order that the dresser may be adjusted to dispose it in properalignment with the face of the wheel to be dressed, the standard 24 isadjustably mounted upon the bracket '23, and as will be apparent fromFig. 3,'th e adjustable mounting comprises a fulcrum pin 31 projectingupwardly from the bracket into a socket in the standard, and a pair ofbolts 32, alsop'rojecting'upwardly from the bracket through slots 33formed in the stand ard.

The bracket is also provided forwardly of the standard with a, pair ofup wardlyextending ears or lugs 34, each of which is equipped with anadjustable screw 35 bearing against the forward'face of the standard.l/Vhen adjustment of the dresser is required,the bolts 32 {are loosened,wheref upon by turning the screws. 35 in the requisitedirection, thestandard may be swung in a horizontal plane about-the fulcrum pm 31center to properly align the dresser.

with the wheels to be dressed, whereupon the bolts 32 are againtightened to lock the dresser in its adjusted position. In order topermit the introduction of the dresser intoposition between the wheels,the wheels are first backed oil" or separated, and when the dresser hasbeen properly positioned, they are permitted to approach until thatwheel toward which the dresser is faced is disposed in position to beoperated upon.

For the purpose of limiting the approachii'igmovementsof the wheels, sothat the'one being operated upon will be disposed in just the properrelation with respect to the dresser, there is mounted upon the shaft 11an'arm 36 provided at its ou'terend with an adjustable abutment screwdisposed in vertical alignment with an abutment shoulder 38 upon themachine frame. Since the arm and the wheel carriages are both connectedwith the shaft 11, it will be apparent that the approaching'movementtoward the dresser of a wheel to be operated upon will be limited byengagement of the screw 37 with the shoulder '38 on the frame..' Byadjusting this screw, the approaching movement may be limited to a finedegree of nicety, and if the dresser is positioned in exact alignmentwith the faces of the wheels to .be dressed, and exactly midway betweenthem as'i'tshould be, when one of the wheels has been dressed, thedresser is reversed to operate upon the other wheel, and this wheel willlikewise be dressed exactly like the first since the approaching.movement of this wheel to the dresser will likewise be controlled by thepreviously adjustedscrew 37.

The arm 36 is preferably clamped to the shaft 11, and if during normalgrinding operation of the machine it' be desirable that the'wheelsapproach more closely together, than is desirable for dressing purposes,the arm may be loosened from the a wheel dressing operation.

shaft so that it will not interfere with this approaching movement.During the dress ing operation the clutch through which power istransmitted to the machine. to

,reciprocate the dressing wheels, is thrown out so that no reciprocationof the wheels takes p lace, but the wheels will be revolved for dressingpurposes by power applied to their respective driving pulleysS).

The details of construction illustrated and described are obviouslycapable of considerable modification without departing from the spiritof the inventiomas defined in the following claims. I j

I claim: 1. In a grinding machine'having opposed grinding wheels movabletoward and from one another, means arranged-adjacent said wheels forwheel dressing purposes and adapted to be moved into the-normal path ofmovement of said wheels, and means'for limiting movement of one of saidwheels toward the said wheel dressing means during 2. In a grindingmachine having a grinding wheel normally movabletoward and from anoperating pos tion, a wheel dresser wheel and movable into the path ofmovement thereof, and adjustable means for {restricting the normalmovement of said wheel toward 'sald operating positionwhen mounted toone side of'the axisof saidsaid dresser is moved into the 'pathof ofsaid wheelstoward said operating posipath of normal movementthereof. 1

. 4. In a griding machine, the combination. of a frame; a pair ofcarriages slidably mounted thereon, a grinding wheelmounted oneachcarriage, mechanism normally operative to simultaneously move saidcarriages toward and from each other, dresser means common to both ofsaid wheels and movable into wheel dressing relation with respectto thewheel faces to be dressed, and an ach justable abutment independent of'said wheels for limiting the approaching movements of said wheels forwheel dressing purposes.

5.'In a grinding machine, a'combination of a pair of grinding wheels,means, for; moving said wheels toward and fromeach other, a wheeldresser arranged for operativeengagement with either wheel for dressingthe grinding faces thereof, and an auxiliary adjustable stop mechanismindependent of said tions when said dresser is moved into the wheelswhereby the approaching movement of said wheels may be aclpistablyregulated for-wheel dresslng purposes.

6. In a grinding machine, the combination" shaft to cause the separationof saidwheels, an arm normally loosely mounted on said shaft but adaptedto be clamped thereto, and an adjustable abutment screw carried by saidarm whereby the approaching movement of said wheels may be limited forwheel dressing purposes.

7. In a grinding machine, the combination 'of a pair of co-axiallyarranged grinding wheels, means for moving said wheels toward and fromeach other, a wheel dresser mounted at one side of said wheels andadapted to be moved into operative position between said wheels, andadjustable means for determining the position of said wheels on theirmovement toward said dresser when the latter is between said wheels.

8. In a grinding machine. the combination of a frame, a pair of grindingwheels slidably mounted in carriages thereon, means for moving saidcarriages toward and from each other, a wheel dresser supporting bracketdisposed at one side of said frame, a wheel dresser carried by saidbracket and adapted to be moved into operative position between saidwheels, and an adjustable stop mechanism cooperative with frame and saidmeans whereby the position of said wheels may be regulated for wheeldressing purposes.

9. Ina grinding machine, the combination of a frame, a pair of grindingwheels r0 tatable in opposed parallel planes on said frame, a bracket onthe frame, a standard supported upon said bracket, a wheel dressercarried by said standard and moveable transversely across the opposedfaces of said wheels, and means including a fulcrum pm and a pair ofad]ust1ng screws whereby V the position of said standard with respect tosaid wheels maybe adjusted.

10. In a grinding machine, the combination of a frame, a pair ofgrinding wheels mounted on saidframe, a standard, a fulcrum pin aboutwhich said standard may be adjusted in a horizontal plane, ahorizontally disposed rod having a plurality of grooves and slidably androtatably mounted in said standard for movement across one of theopposed faces of said wheels, a wheel dresser carried by said rod, aremovable pin adapted to engage each ofsaidgrooves to lock saidrodagainst rotation, said grooves being so arranged in said rod thatupon removal of said pin from said grooves the rod may be rotated topoints where said dresser will engage either wheel and be locked thereatby said pin against rotation, and

'means for locking said standardin adj usted position.

RALPH 1). GARDNER.

